12717509281 has 4 divisors (see below), whose sum is σ = 12720218112. Its totient is φ = 12714800452.

The previous prime is 12717509251. The next prime is 12717509291. The reversal of 12717509281 is 18290571721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18290571721 = 73 ⋅250555777.

It is a cyclic number.

It is not a de Polignac number, because 12717509281 - 2¹¹ = 12717507233 is a prime.

It is a super-2 number, since 2×12717509281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12717509201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347361 + ... + 1356766.

It is an arithmetic number, because the mean of its divisors is an integer number (3180054528).

Almost surely, 2^12717509281 is an apocalyptic number.

It is an amenable number.

12717509281 is a deficient number, since it is larger than the sum of its proper divisors (2708831).

12717509281 is an equidigital number, since it uses as much as digits as its factorization.

12717509281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708830.

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 12717509281 in words is "twelve billion, seven hundred seventeen million, five hundred nine thousand, two hundred eighty-one".